Machine for making circle divisions



Dec. 20; 1927.

1,653,426 W. BAUERSFELD MACHINE FOR MAKING CIRCLE DIVISIONS Filed Jan. 4. 1923 25 devlces Patented Dec. 20, 1927.

TE STATES PAT fl l wanrana BAUERSIELD, or mm, cnnum, nssrenon r rim rrmr on em or mm, enmumr.

EQOHINEIQR MAKING- CIRCLE DIVISIONS.

Application filed January 4, 1928, Serial 110. 610,723, and in Germany January 24, 1922.-

With the manufacture ofcircle-divisions the dividing disc is capable of carrying out slight motions relatively to the dividing tool owing to the play which, unavoidably, the

1 axis of this disc has in its bearings. The present invention attempts to obviate the inaccuracies of the divisions to beobtained, possibly arising by the said play with the known dividing machines. Thenew divid- 1o ing machine is provided with two cutting devices which are disposed o posite-' each other, symmetrically to the axle of the dividing disc, and the circle-division is made with the new machine by always drawing a line each waywith bothcutting devices for each position of the dividing disc. Hence, allly inaccuracies produced by the aforesaid P y observer reads off the division at two places,

opposite each. other with respect to the centre, and takes the mean of both readings- With the new machine it would sufiice to only rotate the'dividing disc through an;

angle of 180 since each oi the two cutting half of the periphery. In many cases, however, it would be preferable to carry out the division in the aforesaid manner over the whole periphery and to produce thereby two com lete divisions. If the angle embraced by t e two cutting devices relatively to the axis ofthe dividing discbe slightly different from 180, a division is producedconsisting of double lines, the middle of which represents the place where the-reading' is to be taken.

The annexed drawing shows in- Fig. 1 a side elevatlon of a constructional example, whllst Fig. 2 .is a plan elevation.

40 a In a standarda there 1s rotatably supported a worm wheel 6 carryin at the top a bolt b forfixing the disc 0 to divided. On the shaft 11 of a worm (1?, engaging in the worm wheel, there is fixed a'spurwheel 'A- shaft 0 carries at one end a' cord pulley-e and on the lars guide body, containing a prismatic carriage guide 9 and a plane carriage guide g. Upon these guides slide two carriages h.' In

- each ofthese two carriages there is pivotally mounted between points'i .a lever 71 on which another lever jis again pivotally bush [keeps the free end are without effect on the result if the draws the lines pertaining to one other end a toothed wheel segment. a which coact's with the spurwheel d. With the aid of three pilf there. is fixed on the standard a a uated, means for rotating twocutting tools, means mounted about an axis 7'. of the lever thereis fixed a cutting tool 9' and at the other end a rod 7". In each carriage is supported in addition a shaft is carrying two cams k and A spring which is assumed to be contained inside a of the lever i in contact with the can 70 whilst the rod 7' is kept in contact with the cam it by the weight of the cutting device. On the shaft is there is also fixed a bevel wheel is. The two bevel wheels 70 mesh with a bevel wheel m each, supported by a shaft m which in its turn-engages by a bevel wheel m in a bevel wheel n fixed on a shaft 10 Another At the one end 7 bevel wheel a fixed on the shaft n engages in a bevel Wheel 0* fixedon'the-shaft 0 If, on' operating the graduating machine,

the shaft e be actuated by meansof a cord running over the pulley 6 the segment 6 meshes during part of each revolution of the disc with the spur wheel d so that the worm wheel Z5 with the disc '0 to be divided is rotated'to acertain extent by means of a worm d. During ,the other part of each revolution of the pulley e the disc 0 stops.

However, during the stop of the disc beach lever 'i and thereby causes the cutting device 7' fitted to this lever to draw a division line in radial direction from within to without. Hereupon the cam it releases the lever i and each of the cams 70 now acts;

Consequently the bfthe cams it acts first on the appertammg disposed inside the. bush Z and In a graduating machines. standard, a dc vice 'rotatably disposed. on the said standard and adapted to receive the article to be gradfor I supporting these cutting tools approximately opposite each other with regard to-the axis of ro ation (if the said device and adapted to operate inra-' the said device,

dial direction from said axis of rotat1on,'and

other-means for actuating the said two' cutting tools;

WAL'THERBJAUEB'SFELD. e 

